The 'Anna Karenina' actress - who is engaged to Klaxons musician James Righton - is bemused by speculation she is pregnant and admits the regular questions have made her worry about her figure.

She said: ''People keep trying to make me pregnant! I'm not ready for it. Yes I'd love to at some point but not this quick, stop trying to make me pregnant.

''I have been asked whether I am pregnant yet about four or five times. And I started thinking, 'Do I look like I'm pregnant ... I'm a very thin girl, I am sure I don't look pregnant!' It's The Ring on my finger!''

Keira is best known for appearing in various period dramas, but she confesses she finds the tight-fitting corsets the roles require very uncomfortable.

Asked whether she thinks her 'Anna Karenina' corsets or the biker look in her recent CHANEL campaign sexier, she told UK radio station Magic 105.4: ''That's tricky. I'd always go for comfort, so I'd say the biker chick look! Corsets stop you breathing which I have always found tricky. You just don't breathe. Breathing is overrated, clearly.''